Legal provisions for optional referendums at national level

Andorra
Constitutionof the Principality of Andorra
Article 45
TheCoprinces, with the countersignature of the Head of Government, or whenappropriate, of the Syndic General, have the political responsibility for:
b) Calling areferendum in accordance with articles 76 and 106 of the Constitution.
Article 76
The Head ofGovernment, with the approval of the majority of the General Council, mayrequest the Coprinces to call a referendum on political matters.
Qualified Law 28/2007, of November 22, amending Qualified Law on theElectoral System and Referendum
Chapter Two.The advisory referendum
Article 72.Call for advisory referendum
The head ofthe Government shall request the co-princes to call a referendum on politicalmatters, when its holding is approved in accordance with the provisions of theConstitution.